dude the point of view in here is so short-term success related and supporting a player is so far away
The answer is your coward manager can't get out of the mentality of a small relagation club's tactics of football and don't know how to benefit from his talents in squad. He wants cenk to play as a off-ball striker which makes cenk as a "non-fit player".
He is used to a passing based attacking mentality which the team attack as one. Sam likes to blame everything else for his mistakes and fans are happy with niasses performance at the moment which I found to be contented with less and non risky.
Yes, cenk is not ready. But not to the EPL, he is just not ready to adjust to the meaningless football sam wants his team to play.